Underground conduit for electric conductors



(No Model.)

J. s. DU Bols. l UNDERGROUND GONDUIT POR ELECTRIC GONDUGTORS.

No. 442,868. Patented Deo. 16, 1890.

ma nonms PETERS co., maremma., wAsn|Nafu n. c,

UNITED STATES PATENT OFFICE.

JOSIAH S. DU BOIS, OF CAMDEN, NE\V JERSEY.

UNDERGROUND CONDUIT FOR ELECTRIC CONDUCTORS.

SPECIFICATION forming part of Letters Patent No. 442,868, dated December 16, 1890.

Application led March 15, 1886. Serial No.195,24=9. (No model.)

T0 all whom t may concern:

Be it known that I, JOSIAH S. DU BOIS, of the city and county of Camden, State of New Jersey, have invented an Improvement in Underground Conduit-s, of which the following is a specification.

Myinvention has reference to underground conduits for electric wires; and it consists in certain improvements, all of which are fully set forth in the following specification, and

' shown in the accompanying drawings, which form part thereof. y

This invention particularly relates to that class of underground conduits set out in Letters Patent No. 314,563, granted to me on March 3l, 1885, and is an improvement upon the construction therein described and shown.

In the drawings, Figure 1 is a sectional elevation of my improved conduit, and shows its connection with the street and also the cellar of a house. Fig. 2 is a cross-section of part of the conduit on line oc x, and Fig. 3 is a perspective View of the adjacent ends of two of the wire-supporting troughs.

A is the conduit, and is formed of a series of metal frames B, secured to Wooden basepieces C, which are embedded in the asphalt or brick which forms the continuous tubular body II of the conduit.

I is the cover or top of the conduit, and is formed of asphalt molded in the form of an arch and connecting with the side walls of the body I-I by a joint J, forming suitable abutments for strengthening the arch-covers. These covers may be divided longitudinally by a lapped or tongue-and-groove joint t'.

The top or upper part of the iron frame B may be provided with projections or bolts K extending out into the asphalt or brick walls,

and will have the effect of anchoring in the' walls and at the same time prevent. any possibility of the frame B being displaced in the direction of the length of the conduit. Projecting from the vertical arms of the frame B are brackets D, having circular apertures open at the top and into which the sectional troughs E are placed and supported. These troughs have their ends e hanged, as shown in Fig. 3, and have the longitudinal slot d in their upper parts. The iianged ends of these troughs are placed together and a clamping-plate F placed back of the `flanges on one side, and

c, to which a horizontal arm f is adjustably I secured, so as to be supported overpeither set of troughs. The wire or cable is attached to said horizontal armor piece f, and by propelling or drawing the motor orcar h through the conduit the wire or cable will be drawn into the slotted trough.

Ii is a man-hole opening into the side of the conduit, and is provided at the top with an air-pipe cover M. The -cellar of the house P is connected by one or more pipes O with the conduit or man-hole L Where it enters the conduit. The Wires S are brought troni the troughs E in said conduit and pass through the pipes O and enter the house through a perforated cap Q, secured to the end of the pipe.

T is an inlet at the side or top of the pipe O just back of the cap Q, and is provided with a removable cover t.

It is a perforated plate adapted to iit the tube O, and supports the wires separated one from another, substantially as in the case of the cap Q. The space within the pipe or tube O and between the cap Q and plate R is iilled with any suitable packing V, such as cotton, or, if desired, a plastic material, the object of which is to seal the end of the pipe O againstescape of compressed lair or gas which is forced into the conduit, as set out in Letters Patent granted to R. M. Hunter on April l0, 1883, No. 275,387.

If desired, the perforated plate It, might be dispensed with, as it is not absolutely necessary. The construction of the bracket and clampingplates for the troughs of this application is much more simple than that shown in Patent No. 314,563, hereinbefore referred to, and economy in construction of a conduit oi' this class is necessary to success.

IVhile I prefer the construction shown, I do not limit myself to the details thereof, as they may be niodiiied in various ways without departing from my invention.

IOO

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In an underground conduit, the coinbination of an asphalt or brick conduit ll, the frame B, secured therein, having supportingbraekets D and anchor-pieces K, tubes or troughs E, supported upon said brackets, provided With longitudinal slots d and Ilanges e, clam pin g-plate F, corresponding to the brackets, and bolts G, adapted to clamp said flanges e and clamping-plates I11 together, substantially as and for the purpose speeitied.

2. In an underground conduit, the combination of an asphalt or brick conduit Il, containing tubes or troughs 'E for the wires supported therein, a pipe O, extending from the conduit, wires brought through said pipe O into the troughs or tubes E in the conduit, and packing about said wires in the pipe to make it substantially air-tight, substantially as and for the purpose specified.

3. In an underground conduit, the eonlbination of an asphalt or brick conduit ll, containing tubes or troughs E 'for the Wires supported therein, a pipe O, extending from the conduit, wires brought through said pipe O .into the troughs or tubes E in the conduit, a perforated cap Q.,throu gh which the Wires pass and are separated one from another, anda packing about said Wires in the pipe to make it su bstantially air-tight, substantially as and for the purpose specified.

4. In an undergroui'id conduit, the combination of an asphalt or brick conduit Il, con taining tubes or troughs E for the wires supported therein, a pipe O, extending from the conduit, Wires brought through said pipe O into the troughs or tubes E in the conduit, a perforated cap Q and a perforated plate R, through which the Wires pass and are separated one from another, and a packing about said wires inthe pipeto make it substantially air-tight, substantially as and t'or the purpose speeilied.

5. The combination of the conduit A, the pipe O, the cap J, having perforations, wires S, passing through the pipe O and cap, an entrance or hand-hole l to the end of the pipe and next to the eap, and packing V around the wires, substantially as and lor the purpose specified.

In testimonyof which invention [hereunto set my hand.

.'I'OSIAII S. DlY BOIS.

IVitnesses:

R. M. HUNTER, ANDREW ZANE, Jr. 

